CAJ | 학술논문

目的应用530 nm单色光光照建立一种新型近视眼动物模型.方法 20只约2周龄健康雄性豚鼠,随机分成两组(n=10),实验组和对照组分别在绿光(530 nm)和白光(色温5000 k)下进行饲养.设置照明参数:光量子数相同,为每秒3×10~(-4)μmol/cm~2;实测光强度绿光为0.150 mW/cm~2,白光为0.247 mW/cm~2.实验前每组进行眼球生物学测量(屈光度、角膜曲率、眼轴各部分长度),光照后12周重复测量以上数据,每只豚鼠均取右侧眼参数进行统计分析.结果光照前两组生物学测量参数差异无显著性.光照12周后,绿光组屈光度发生-3.125±0.76 D的变化,白光组为-1.075±0.71D,绿光组同对照白光组相比平均形成约2.0 D的近视,差异有显著性;绿光组眼轴和玻璃体腔分别增长0.98±0.13 mm与0.33±0.14 mm,对照组分别为0.77±0.22 mm与0.13±0.14 mm,绿光组较对照组眼轴和玻璃体腔长度延长较快,差异有显著性;光照后两组角膜曲率半径、前房深度和晶状体厚度均发生不同程度增加,但两组间变化差异无显著性.结论 530 nm单色光诱导豚鼠眼球眼轴和玻璃体腔长度延长较快,产生近视.
목적 응용530 nm단색광광조건립일충신형근시안동물모형.방법 20지약2주령건강웅성돈서,수궤분성량조(n=10),실험조화대조조분별재록광(530 nm)화백광(색온5000 k)하진행사양.설치조명삼수:광양자수상동,위매초3×10~(-4)μmol/cm~2;실측광강도록광위0.150 mW/cm~2,백광위0.247 mW/cm~2.실험전매조진행안구생물학측량(굴광도、각막곡솔、안축각부분장도),광조후12주중복측량이상수거,매지돈서균취우측안삼수진행통계분석.결과 광조전량조생물학측량삼수차이무현저성.광조12주후,록광조굴광도발생-3.125±0.76 D적변화,백광조위-1.075±0.71D,록광조동대조백광조상비평균형성약2.0 D적근시,차이유현저성;록광조안축화파리체강분별증장0.98±0.13 mm여0.33±0.14 mm,대조조분별위0.77±0.22 mm여0.13±0.14 mm,록광조교대조조안축화파리체강장도연장교쾌,차이유현저성;광조후량조각막곡솔반경、전방심도화정상체후도균발생불동정도증가,단량조간변화차이무현저성.결론 530 nm단색광유도돈서안구안축화파리체강장도연장교쾌,산생근시.
Objective In the early life period when eyes grow rapidly,visual experience can play an important role in axial growth and refractive development. For instance, depriving the eye of form vision during infancy will accelerate axial growth, resulting in substantial amounts of myopia, called form deprivation myopia (FDM). Similarly, imposing the eye with a negative lens produces compensating myopic growth in many species, called defocus induced myopia (DIM) . As one of the important visual experiences,color vision and its effects on eye growth deserve to be investigated. The purpose of this study was to investigate the effect of 530 nm monochromatic light and establish an innovative model of myopia in guinea pig by exposing to this monochromatic light. Methods Twenty male guinea pigs at 2 weeks old were randomly assigned to two groups (n = 10) . The experimental group was raised under the condition of 330 nm monochromatic light illumination. The control one was bred under white light illumination with 5000 k color temperature. These guinea pigs were raised in a specially designed cage. The light source was provided by specially made LEDs (green: peak value 530 nm and half bandwidth 30 nm; white: color temperature 5000 K) . The illumination parameters of the two groups were identical and the light quantum number was 3 x 10~(-4)μmol·cm~(-2)·s~(-1) . Through measuring,the irradiance value was 0.150 mW·cm~(-2) for green light and 0.247 mW·cm~(-2) for white light approximately. All animals were kept under a 12/12 h light/dark cycle (light: 8 a.m. - 8 p.m. ) ,in the temperature of 22℃ - 26℃ and a relative humidity of 55% -65% . Both groups underwent biometric measurement including refraction,corneal curvature and axial length,etc. before and after twelve weeks treatment. The refraction was examined using a streak rednoscope and trial lenses in a dark room one hour after topically administering a cycloplegic eye drop. The radius of comeal curvature was measured with a keratometer (Topcon OM-4, Japan) and axial components was measured by A-scan ultrasonagraphy ( Opticon Hiscan A/B). Repeated measurements were undertaken. Only the right eye's parameters of each guinea pig were used for analysis. Unpaired (-tests were used in all comparisons between the two groups of eyes with a statistical analysis software (Stata, version 7.0) . Results Before treatment, the refraction of experimental group was 4.6 ± 0.59 D.and that of the control group was 4.63 ± 0.48 D. The axial and vitreous body length was 7.48 ±0.11 mm and 3.16 ±0.07 mm in the experimental group,respectively,and 7.55 ±0.16 mm,3.21 ±0.09 mm in the control. The differences between the biometric parameters of the two groups including refraction, comeal curvature and axial components were not significant ( P > 0.05) . However,after a twelve-week exposure, the variation of refraction in the experimental group was -3.125 ± 0.76 D,and - 1.075 ± 0.71 D was observed in the control group. There was a 2.0 D myopia in the experimental group compared with the control. Axial length grew 0.98 ± 0.13 mm in the experimental group and 0.77 ± 0.22 mm in the control. Vitreous body extended to 0.33 ± 0.14 mm and 0.13 ± 0.14 mm in the two groups, respectively. The refraction of the experimental group shifted more towards myopia ( P < 0.0001) accompanied with a more accelerated speed of axial growth and vitreous body's extension ( P < 0.05) compared with that of the control group. There were no significant differences in the radius of comeal curvature, the depth of anterior chamber and the lens thickness between the eyes of the two groups at the end of the experiment ( P > 0.05) . Conclusion The 530 run monochromatic light can accelerate the prolongation of axial length and vitreous body inducing axial myopia in guinea pigs.